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Katsuki is furious. Eijirou was out all night with his fucking slick sniffer alpha friends and NOW he’s back home, passed out their couch, and he reeks of desperate omega. It’s so rank that even Katsuki’s useless beta nose can smell it.
He doesn’t think Eijirou would be capable of cheating on him but with how he’s smelling? WHO THE FUCK KNOWS!
He’s going to murder him. After he wakes up! He growls and goes out on his run. He thinks it’ll help clear his head but it just makes him even enraged.
When he comes back home, Eijirou is trying to sneak into the shower.
“Where the fuck were you?” he demands, tossing his bottle on the ground. Katsuki is always loud but when he’s angry? He’ll fucking upturn everything around him.
“Kitty...you’re back. I, uh, we just went to the club!” Eijirou stammers, trying to edge into the bathroom.
“Yeah?” Katsuki gets up in his face, “why didn’t you come to bed when you came home?”
“I - I didn’t wanna wake you, kitty!”
“Why are you trying to run away from me right now, Eijirou?” Katsuki says it calmly. He’ll give Eijirou a chance to explain and if he fucks this up, Katsuki is going to blow this whole house and his stupid fucking mate sky high.
Eijirou’s eyes widen comically, “you can smell it, can’t you?”
Katsuki’s eyebrows furrow as he nods. Eijirou is lucky he loves him enough to be patient.
“I’m sorry, kitty! It’s not what you think! There was this omega at the club and he was distressed and in heat and if I didn’t let him, he would have dropped! What kind of hero would I be if I let him drop!?”
Katsuki feels a weird pain in his chest. He doesn’t really understand it. He’s only felt it once before when he thought Eijirou died during a mission.
“So you fucked him?” he asks before he needs to make sure.
“WHAT! NO KATSUKI NO! I promise! I did let him dance on me though...”
Katsuki glares at Eijirou. The pain is gone and fury is back in its place. Why the fuck does his alpha think everyone is his fucking problem to save? Boo fucking hoo if he has to hurt some fucking stranger's feelings!
Eijirou is careful throughout the day and doesn’t let Katsuki raise a finger to do anything. He tries cooking for Katsuki and obviously burns the food so he orders Katsuki’s favourite curry.
A few days later Katsuki tells him if something like that happens again, he’ll personally kill the omega. Eijirou whines and apologizes and is so, so sorry but also says he would do it again if needed.
Katsuki grits his teeth and when Eijirou’s next rut comes around, he locks him alone in the quirk-proof enclosure they’ve built into their house and bounces on a dildo in front of the only window the whole time.
He ignores how his mate scratches at the window, leaving deep grooves in it. Fucker needs to understand Katsuki has instincts too even if he can’t smell. His inner beta is going frantic about not being enough for Eijirou. He knows it’s all bullshit. Eijirou loves him more than it should be possible to love someone. But his beta would have solved the problem differently and Katsuki doesn’t know how to explain to it that Eijirou doesn’t think like that, his inner alpha saw a distressed omega and couldn’t bear to hurt it more and Eijirou’s a fucking puppy so he agreed because he didn’t want to upset a person.
But he needs to pay and understand the hurt he’s caused Katsuki. So Katsuki bounces on his dildo and spreads his cheeks wide and lets his face go stupid the way it does when he's drunk on pleasure so Eijirou has a great view of what he’s missing out on. He can use his fucking rut toys.
Eijirou’s inner alpha is raging. It blames Eijirou for not holding it in line. It knows its instincts are wrong sometimes and it’s Eijirou who is supposed to make sure they don’t upset their beta. Their beautiful, livid Katsuki who is so obviously hurting.
So...he does the next logical thing and goes to get his cock pierced with a revered Prince Albert the second his rut is over. The worst part is Katsuki isn’t there to hold his hand through it! He cries a little as it happens and the piercer looks at him weird but his inner alpha tells him to get his shit together! They’re doing this for Katsuki and that’s all that matters. Quirk healings allow the healing period to basically be nonexistent and he’s immediately good to go.
He goes home, drops his pants, puts a leash through his new piercing, and hands it to Katsuki. It’s not like his cock hasn’t always been Katsuki’s anyway.
Katsuki wants to stay mad when Eijirou drops the leash in his hand but if he’s honest, he LOVES it. It’s an outward display of the control he craves over Eijirou’s alpha. He’s a bottom through and through but he’s in charge, got it?
His beta relaxes too. If Eijirou’s alpha is willing to do this and as Eijirou said, actually brought up the idea, then there’s nothing to worry about. There’s no omega with a leaking pussy that’s going to be able to steal his man.
He grows to love leading Eijirou around by the gold chain he’s bought, tugging a little too hard when he’s mad. Not enough to be painful...well, painful in a way that’s not pleasurable, but enough for Eijirou to not doubt his feelings just because he can’t smell them or whatever.
He likes it when they go out with the chain discreetly wrapped around his hand, their height difference working to their advantage here as Eijirou's cock is at arm's height for him. He also loves leaving the chain on when they fuck. The ridges on it massage Eijirou's cock and his walls so wonderfully. And if he really, really wants to, he can yank it to control Eijirou’s thrusts. Faster? Slower? Deeper? It’s in his hands. He’s fucking himself using Eijirou’s cock.
When Eijirou fucks up big again and tries to blame it on alpha instincts, Katsuki nails the chain to the floor, leaving less than a few inches of it free. Eijirou has no choice but to kneel by his feet all day.
He does feel a little bad so he sits on his alpha’s face and lets him eat to his heart’s content. The cock stays chained though.
They’re going to be fine. Eijirou just can’t be trusted to control his alpha so Katsuki will do it for him instead.